Discover why geothermal heating and cooling is the most energy efficient technology available to homeowners, and how all homes--new or retrofit, in hot or cold climates--can use this reliable, silent, non-polluting way of extracting free energy from the earth. Contents: - Geothermal system options, including open-loop, closed-loop and DX configurations, using horizontal and vertical earth loops - The importance of finding a qualified contractor - Costs, tax credits and payback issues, plus calculating increased home values - Who is using geothermal energy, including the author s firsthand experiences, home profiles from around the country as well as an overview of commercial/institutional projects - How solar electricity can be used to power the system, plus other future trends - Unraveling the science and technology of geothermal heat pumps (GHPs) - Understanding GHP performance standards, ratings and warranties - Comprehensive appendix with helpful resources (manufacturers, associations, etc.) and a career section for those interested in entering the field